A printing company uses the formula C = 0.5x + 10 to find the cost of printing x business cards. Which equation correctly solves the formula for x?A) x = 2C - 20 B) x = -2C + 20 C) x = C + 10/0.5D) x = C - 0.5/10
Accepted Solution
A:
c = 0.5x + 10
---------------------------------------------------------- Switch side : ---------------------------------------------------------- 0.5x + 10 = c
---------------------------------------------------------- Take away 10 from both sides : ---------------------------------------------------------- 0.5x = c - 10
---------------------------------------------------------- Multiply by 2 through : ---------------------------------------------------------- x = 2c - 20
---------------------------------------------------------- Answer : x = 2c - 20 (Answer A) ----------------------------------------------------------